e.g. for these following disk configuration in libvirt. <disk type='file' device='disk'> <driver name='qemu' type='qcow2'/> <source file='/var/lib/xen/images/001/disk0.qcow2'/> <target dev='hdc'/> without this patch, it will be "qemu:/var/lib/xen/images/001/disk0.qcow2,hdc,w" but it should be(if with this patch) "qcow2:/var/lib/xen/images/001/disk0.qcow2,hdc,w" Signed-off-by: Bamvor Jian Zhang <bjzhang(a)suse.com&gt; --- src/xenxs/xen_xm.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/src/xenxs/xen_xm.c b/src/xenxs/xen_xm.c index b2db97d..29835b4 100644 --- a/src/xenxs/xen_xm.c +++ b/src/xenxs/xen_xm.c @@ -1209,7 +1209,10 @@ xenFormatXMDisk(virConfValuePtr list, type = "aio"; else type = virStorageFileFormatTypeToString(format); - virBufferAsprintf(&buf, "%s:", driver); + if (!STREQ(type, "qcow2")) + virBufferAsprintf(&buf, "%s:", driver); + else + virBufferAsprintf(&buf, "%s:", type); if (STREQ(driver, "tap")) virBufferAsprintf(&buf, "%s:", type); } else { -- 1.8.1.4